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Method And System For Selectively Distributing Luminescence Material Precursors - Patent 6780648


The present invention relates to a method and system for selectively distributing reactant precursors to separate locations on a receiver. Particularly, the invention relates to a method and system for preparing a combinatorial library ofluminescence material precursors for screening by combinatorial high throughput screening (CHTS).Luminescence materials, also called phosphors, can convert a certain type of energy into electromagnetic radiation over thermal radiation. A phosphor is usually composed of a host lattice doped with fluorescent-active elements (activator)present in up to a few mole %. Phosphors have been widely used in fluorescent lamps, displays, scintillation, etc. Although the search for advanced phosphors started about a century ago, the new photonic technologies, including mercury-free fluorescentlamps, various flat panel displays, computed tomography (CT), etc., require new phosphors with advanced properties: These include high quantum efficiency, good absorption of the excitation energy, adequate color coordinate, long lifetime, and low cost.The discovery of advanced oxide phosphors with multiple superior qualities for display applications remains a difficult problem. The specific spectral properties, absorption, quantum efficiencies, and lumen maintenance depend on complexinteractions between the excitation source, host lattice, structural defects, and fluorescent dopants. Luminescence properties are highly sensitive to the changes in dopant composition, host stoichiometry, and processing conditions. Consequently, theidentification of phosphors that are ideally suited to the requirements of a given display technology is highly empirical.Combinatorial chemistry techniques have been applied to search for new phosphors in thin film form or powder form. Sun, Ted X., Biotechnology and Bioengineering Combinatorial Chemistry, 61, 4 (1998/1999) shows that a combination of a thin-filmdeposition and a masking strategy can be used to generate a thin f

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